Evolution of interfacial toughness of a thermal barrier system with a Pt-diffused γ/γ′ bond coat

X. Zhao; J. Liu; D. S. Rickerby; R. J. Jones; P. Xiao

doi:10.1016/j.actamat.2011.07.001

Evolution of interfacial toughness of a thermal barrier system with a Pt-diffused γ/γ′ bond coat

X. Zhao, J. Liu, D. S. Rickerby, R. J. Jones, P. Xiao

Research output: Contribution to journal › Article › peer-review

Abstract

A strain-to-fail method has been employed to examine the interfacial adhesion of electron beam-physical vapor deposited thermal barrier coatings (TBCs) with a Pt-diffused γ/γ′ bond coat. Based on a previously established model, the estimated interfacial toughness decreases with oxidation time of TBCs. Furthermore, the interfacial toughness value varies considerably with the use of different Young's moduli in the model. It is believed that the modulus obtained from beam bending represents the columnar structure of the TBC. In this case, the mode I interfacial toughness was found to vary from 10 J m-2 for as-deposited TBCs to 0.79 J m-2 for the 60 h oxidized TBCs. The degradation of adhesion could be attributed to the defect formation and impurity segregation at the TGO/bond coat interface, which is associated with the diffusion of Pt. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	6401-6411
Number of pages	10
Journal	Acta Materialia
Volume	59
Issue number	16
DOIs	https://doi.org/10.1016/j.actamat.2011.07.001
Publication status	Published - Sept 2011

Keywords

Bond coat
Buckling
Coating
Interfacial toughness
Oxidation

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10.1016/j.actamat.2011.07.001

Helping Rolls-Royce plc improve jet engine efficiency
Xiao, P. (Participant) & (Participant)
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title = "Evolution of interfacial toughness of a thermal barrier system with a Pt-diffused γ/γ′ bond coat",

abstract = "A strain-to-fail method has been employed to examine the interfacial adhesion of electron beam-physical vapor deposited thermal barrier coatings (TBCs) with a Pt-diffused γ/γ′ bond coat. Based on a previously established model, the estimated interfacial toughness decreases with oxidation time of TBCs. Furthermore, the interfacial toughness value varies considerably with the use of different Young's moduli in the model. It is believed that the modulus obtained from beam bending represents the columnar structure of the TBC. In this case, the mode I interfacial toughness was found to vary from 10 J m-2 for as-deposited TBCs to 0.79 J m-2 for the 60 h oxidized TBCs. The degradation of adhesion could be attributed to the defect formation and impurity segregation at the TGO/bond coat interface, which is associated with the diffusion of Pt. {\textcopyright} 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",

keywords = "Bond coat, Buckling, Coating, Interfacial toughness, Oxidation",

author = "X. Zhao and J. Liu and Rickerby, {D. S.} and Jones, {R. J.} and P. Xiao",

year = "2011",

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T1 - Evolution of interfacial toughness of a thermal barrier system with a Pt-diffused γ/γ′ bond coat

AU - Zhao, X.

AU - Liu, J.

AU - Rickerby, D. S.

AU - Jones, R. J.

AU - Xiao, P.

PY - 2011/9

Y1 - 2011/9

N2 - A strain-to-fail method has been employed to examine the interfacial adhesion of electron beam-physical vapor deposited thermal barrier coatings (TBCs) with a Pt-diffused γ/γ′ bond coat. Based on a previously established model, the estimated interfacial toughness decreases with oxidation time of TBCs. Furthermore, the interfacial toughness value varies considerably with the use of different Young's moduli in the model. It is believed that the modulus obtained from beam bending represents the columnar structure of the TBC. In this case, the mode I interfacial toughness was found to vary from 10 J m-2 for as-deposited TBCs to 0.79 J m-2 for the 60 h oxidized TBCs. The degradation of adhesion could be attributed to the defect formation and impurity segregation at the TGO/bond coat interface, which is associated with the diffusion of Pt. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

AB - A strain-to-fail method has been employed to examine the interfacial adhesion of electron beam-physical vapor deposited thermal barrier coatings (TBCs) with a Pt-diffused γ/γ′ bond coat. Based on a previously established model, the estimated interfacial toughness decreases with oxidation time of TBCs. Furthermore, the interfacial toughness value varies considerably with the use of different Young's moduli in the model. It is believed that the modulus obtained from beam bending represents the columnar structure of the TBC. In this case, the mode I interfacial toughness was found to vary from 10 J m-2 for as-deposited TBCs to 0.79 J m-2 for the 60 h oxidized TBCs. The degradation of adhesion could be attributed to the defect formation and impurity segregation at the TGO/bond coat interface, which is associated with the diffusion of Pt. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

KW - Bond coat

KW - Buckling

KW - Coating

KW - Interfacial toughness

KW - Oxidation

U2 - 10.1016/j.actamat.2011.07.001

DO - 10.1016/j.actamat.2011.07.001

M3 - Article

SN - 1873-2453

VL - 59

SP - 6401

EP - 6411

JO - Acta Materialia

JF - Acta Materialia

IS - 16

ER -

Evolution of interfacial toughness of a thermal barrier system with a Pt-diffused γ/γ′ bond coat

Abstract

Keywords

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Impacts

Helping Rolls-Royce plc improve jet engine efficiency

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